Vat dye.



. UNITED STATES PAEENT OFFICE.

WILHELM BAUER, 0F VOHWINKEL, AND ALFRED HERRE AND RUDOLF MAYER, 0F

ELBERFELD, GERMANY, ASSIGNOBS TO FARBENFABRIKEN VORM. FRIEDR. BAYER &'

CO., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

VAT DYE.

985,768.- No Drawing.

To all whom it may concern: i

Be it known that we, \Vrmnamr BAUER, residing at-Volnvin'kel, and .\LFRI-ID llctnm and Rnnocr Mar -1n, residing at l llberfeld, Gorand productiol'i of new and valuable vat dycstutl's. 'l'hey ame'obtained by coudcnsing lwta-naphthisatin derivatives contalnmg more. than one, halogen atom in which the oxygen of tho alpha-kcto group is replaced by easily movabh-or replaceablesubstituents, a, r halo cn, snltur. theiamino group, the alhoxy group with phenolic compounds, especially .l-anthrob l-naphthoh 1.5- and l.8- dioxyauthraceucs and their substituted derivativcs haying a tree ortho position to the h \'drox \'c groiip.

The n w dyes :i'rc in a dry state dark blue crystalline powders with a metallic luster whi h are soluble. in hot nitrolwnzcue genern ith a blue coloration, and which yield with h \'dro. ultitc and caustic soda lye gen- -crall orange rats dyeing cotton after exposnrc to air blue-gray to black shades rcnarlt'abl f r their fastncss to chlorin.

in order to illustrate the new process more full We can proceed as follows, the parts being by .'l L lIlI Jl parts of dibromola-ta-napbthisatin are converted into the alphahloral by llttll'lltg'illtill with 220 parts of l(l,, and 1500 parts of dry chlorohen- Zeno. "The mixture thus obtained is then added to a warm solution, which is well .stirrcd. of 210 parts of I-anthrol in 1500 parts of dry chlorobouzcne; stirring is contmucd for some time while it 1s hot. After cooling the dye is filtered off and washed with bcnzene'and ether. It isa dark blue powder soluble in concentrated sulfuric acid wlth a blue-black color, scarcely soluble in hot Specification at Letters Patent.

Application filed June 18,

1910. Serial No. 567,687.

- .Iatented Mar. 7, 1911.

benzene with a greenish-blue color. It; forms an orange vat with hydrosulfite and caustic alkali, from which cottonis dyed after exposure to air n1 fast grayish-blue to greenish black shades. Dichloro beta naphthisatin and higher halogenated beta-imphthisat ns furnish similar 'n'oducts;

\Ve clann:

1. The herein described new dyestuffs obtaiuahle-t'roma halogenated beta naplithh,

satin derivative containing more than one halogen atom in which thc oxygen ot' the alpha-keto group is replaced by easily movable or replac able substitucnts and a phenolic compound, which dycstult's a re. in a dry,

state. dark blue crystalline powderswith a metallic luster which are soluble indiot nilrobcnzeue generally with a blue coloration; and which yield with hydrosultite and cans- 'tic soda l \e rats dyeing cotton at'ter exposure toair from blue-gray to black shades remarkable for their fastncss to chlorin, substantially as described.

The herein described new .l \'es'tutt' obtainable from diln'omo-bcta-iiaphthisatinalpha-chlorid and 1-anthr0l, which dyestutt is in a dry state a dark blue powder, soluble in concentrated sulfuric acid with a bluehlack color. and which yields with hydrosullite and caustic soda lye an orange vat from which cotton is dyed a grayish-blue to greenish black remarkable for its fastness t0 chlorin, substantially as described.

In testimony whereof we havehereunto set our hands in the presence of two subscribing witnesses.

\VILTT'ICLM BAUER. [L.s.] ALFRED IIERRE. [11.5.] RUIJOLF MAYER. [1,. 8.] \Vitnesses:

Orm Ktimo, CHAS. J WRIGHT. 

